A light ray is incident perpendicular to one face of a $9 0^{\circ}$ prism and is totally internally reflected at the glass-air interface. If the angle of reflection is $4 5^{\circ}$ , we conclude that the refractive index $n$

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Angle of incidence i > C for total internal reflection. Here i = 4 5 ∘ inside the medium. ​ ∴ 4 5 ∘ > sin − 1 ( 1/ n ) ⇒ n > ​ 2. ​

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